HERO—Continued electrical, 3-3 non-electronic relay systems, 3-3 Hybrid AUTODIN Red Patch Service (HARPS), 1-11 I ITA #2 Code, 1-6 L LDMX, 1-13 flexibility,  1-14 high-speed processing, 1-13 secure communications, 1-13 statistical and management reports, 1-14 system  reliability,  1-13 M Magnetic Tape Terminal Stations (MTTSs), 1-11 MARCEMP,  1-3 background, 1-3 interfaces, 1-3 requirements, 1-3 Master Station Log (MSL), 1-21 Material destruction, 4-1 control, 4-2 destruction, 4-2 inspection, 4-2 inventory,  4-2 methods,  4-1 receive, 4-2 reports, 4-2 verification, 4-2 N NAVCOMPARS,  1-2,  1-13 background, 1-13 services,  1-13 NAVMACS, 1-14 Net control station (NCS), 1-15 Nets, radiotelephone, 2-15 acknowledgement of messages, 2-20 break-in procedures, 2-20 canceling messages, 2-19 communications conditions, 2-18 corrections,  2-18 directed,  2-15 emergency  silence,  2-21 establishing communications, 2-16 free,  2-15 opening the net, 2-16 receipt of messages, 2-20 repetitions, 2-19 responsibilities,   2-15 sequence of call signs, 2-17 signal  strength  and  readability,  2-17 verification of messages, 2-20 NSTA,  1-1 O OAS, 1-4 Operating  signals,  2-8 P PCMT,  1-2 message  accountability,  1-2 recall processes, 1-2 requirements, 1-2 Phonetic alphabet, 2-3 Phonetic numerals, 2-4 Plain Language Addresses (PLAs), 1-4 Prowords, 2-5 Q Quality  Control,  1-21 AN/SSQ-88/A/B system, 1-21 INDEX-3